Abstract
We investigated the formation mechanism of a faceted crystal-melt interface by in situ observation. It was directly proved that a wavy perturbation is introduced into a planar crystal-melt interface and the perturbation results in zigzag facets. Such a facet formation process was observed when growth velocity was high, although planar interfaces were maintained at low growth velocities. It was shown by theoretical analysis that the negative temperature gradient generated by the latent heat of crystallization at high growth velocities amplifies the perturbation and leads to the facet formation.
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